GEOL 104 Lect10

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Geological Sciences and Geological Engineering
GEOL 104
Michael T.Mc Bride

Note study the mt st helens eruption Sedimentary RocksForm at or near Earths surfaceBy the accumulation and consolidation of sedimentsMay be clastic origin chemical or biochemicalClastic are solid particles transported by wind water etcbiochemical are sediments of biological originchemical are dissolved ions precipitated from solutiongenerally exhibit stratification bedding or layeringSedimentary rock make up about 5 of the Earths crust however 75 of exposed rocks are sedimentarySedimentary rocks are the rocks that show previous life on EarthSedimentary rocks are classified in three groupsClastic Sedimentary RocksNote Clay is both a particle size and a mineral groupGravel is 2mmConglomerate is a rounded rockgravel sized Breccia is an angular rockgravel sizedoften a
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